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In 2266, Jaeger was part of a fifteen-man survey team that was assigned to Tlaoli IV. When the team discovered a number of wrecked starships on the planet's surface, Jaeger gathered all the lieutenants together and they all decided to send a team into the caves to investigate. Jaeger led the team himself, but they soon lost contact with the other teams due to the transperiodic ores on Tlaoli IV's surface. (TOS - The Janus Gatenovel: Present Tense)

In 2267, Jaeger accompanied a landing party to the surface of Gothos to search for the missing CaptainKirk, after he was captured by the omnipotent being known as Trelane. Trelane recognized Jaeger's name's national origin, gave a smart salute and spoke to him in German, saying "Ein Deutsch Soldat, nein? Ein, zwei, drei, vier, gehen wir mit dem Schießgewehr!", while miming a military march. In response to Trelane's question ("A German soldier, no?"), Jaeger replied that his specialty was as a scientist, not as a military man. (TOSepisode: "The Squire of Gothos")